Gu Seo Jin, a wealthy third-generation chaebol, runs the Wonder Land theme park and seems to have it all—intelligence, wealth, and charm. But a childhood trauma left him with a split personality: one cold and ruthless, the other warm and kind. Because of this, he avoids relationships and vows never to fall in love.

When Seo Jin decides to shut down the struggling circus at Wonder Land, he clashes with Jang Ha Na, the passionate circus master determined to save it. As they work against each other, Ha Na finds herself drawn to both sides of Seo Jin—without knowing they’re two halves of the same man.